local train; section train
Refers to a train that stops at every station along a specific section of a line, as opposed to express or rapid services.
This local train stops at every station.
普通列車 is a more general term for a local train that stops at all stations, while 区間列車 emphasizes operation within a specific section.
快速列車 is a rapid service that skips some stations, unlike 区間列車 which stops at every station.
Compound of 区間 (section) and 列車 (train). The exact historical derivation is uncertain, but the term is conventionally used in railway contexts.